A Bit on LaTeX

LaTeX is a high-quality typesetting system, with features designed for
the production of technical and scientific documentation. LaTeX is a markup
language including a powerful macro language, and has established as the de
facto standard for the communication and publication of scientific documents.
Further information can be found at https://www.latex-project.org,
a (not so) short introduction
https://ctan.org/tex-archive/info/lshort/.

LaTeX sources are kept in files with the extension .tex
(see an example LaTeX file)
and are "compiled" to an intermediate format called DVI using

latex seminar.tex

which then can be converted to Postscript or PDF by means of

dvips seminar.dvidvipdf seminar.dvi

BibTeX is a regular companion to LaTeX that provides support for managing
bibliographic databases and including proper citations in LaTeX documents.
BibTeX "databases" are kept in plain text files with the extension
.bib
(see an example BibTeX file).

In case BibTeX is used, the latex and bibtex commands have to be invoked
alternately:

latex seminar ; bibtex seminar ; latex seminar

(Observe that we can safely omit filename extensions, in
which case the tools will assume the appropriate one.)